Model # B121ADJ-40R

Internet #202077339

Store SKU #208653

null 1-Gang 21 cu. in. Non-Metallic Wall Box with Adjustable Bracket

1-Gang 21 cu. in. Non-Metallic Wall Box with Adjustable Bracket

  • For New Work applications
  • 21 cubic inch capacity
  • Ideal for various drywall thicknesses and wall finishes
$241 /each
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Frequently Bought Together

Product Overview

The Vertical 21 cu in. PVC 1-Gang Wall Box Adjust-a-box with Adjustable Bracket for Vertical Mount is designed to allow adjustment of depth after the wall covering has been installed. Adjusts to any wall covering. The Zip Box Blue 1-Gang 20 cu. in. Old Work Non-Metallic Switch and Outlet Box are designed to work with non-metallic sheathed cable in accordance with Article 314 of the NEC. Great for light commercial and residential applications, the box is crafted with non-conductive PVC for durability and is fire rated and UL listed to help ensure safety.

  • Typical uses are in kitchens and bathrooms
  • Protects indoor wiring from impacts, dust and wear
  • Thermoplastic construction resists rust and won't conduct electricity
  • Mounts to standard wood or metal stud horizontally
  • Adjusts from 0 to 1 1/2 in. D
  • Convenient adjustable bracket for ease of installation
  • UL listed

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)
Trade Size (in.)


Box Type
Wall box
Color Family
Electrical Product Type
Number of Gangs
Number of Knockouts
Package Quantity
Packaging Type
Consumer Packaging
Power Distribution Features
Fire Rated
Product Weight (lb.)

Warranty / Certifications

Certifications and Listings
1-UL Listed
Manufacturer Warranty

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Customer Questions & Answers

What is the fire rated time? Can it be used on Fire Walls?

What is the fire rated time? Can it be used on Fire Walls?
Asked by: CB
The box has a two hour fire rating.
Answered by: Thomas & Betts
Date published: 2017-04-10

How do you ground it?

Asked by: AlohaJay
You don't. It's a plastic box.
Answered by: B0ttl3z
Date published: 2017-05-25

What is the the max adjust measurement on this box

we need a box to adjust up to 1-1/4" because we need to use two Pieces 5/8" shell rock please let me know.
Asked by: Mandy
The box adjusts from 0 to 1-1/2 inches. Based on what you mentioned, this should work for your application.
Answered by: Thomas & Betts
Date published: 2017-05-25

You say you have over 5000 in this store. There is only 1?

Asked by: Eshel
Thank you for your recent inquiry with The Home Depot, Eshel. To determine availability you will need to localize the item online by using a zip code or contact your local Home Depot store. We appreciate your business and look forward to serving you in the future. Thank you for shopping with The Home Depot.
Answered by: Lex
Date published: 2016-06-06
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Customer Reviews

1-Gang 21 cu. in. Non-Metallic Wall Box with Adjustable Bracket is rated 3.6 out of 5 by 8.
Rated 2 out of 5 by from Don't buy. I installed six of these before putting up new drywall. As others have said, the desig... Don't buy. I installed six of these before putting up new drywall. As others have said, the design of these boxes is flawed. While the metal bracket is very sturdy, the sliding mechanism creates too much play, causing the box to wiggle, especially with those screw-less Decora plates. Wrecking my head now about how to fix this.
Date published: 2017-04-13
Rated 1 out of 5 by from Do Not Recommend Great concept but has fatal flaw. The box gets pushed in or pulled forward when plugging in or unplugging an appliance, in my case, simple things such as an alarm clock, small lamp etc. I wish I knew this before I installed 20 of them in my new home addition. I wonder if they actually tested these boxes for performance before commencing mass production and sales.
Date published: 2014-07-17
Rated 5 out of 5 by from best box on the market These boxes are awesome because your can adjust the face of the box to the finish wall as required by California code. This feature insures the secure fit of the outlets or switches you attach with no gaps behind the cover-plate.
Date published: 2011-11-29
Rated 5 out of 5 by from easiest install ever In a recent remodel I used these and even though they were a little more cost wise was thoroughly sold on them. They are without a doubt the easiest to install/and or reposition before securing, and the debt adjustment makes it ideal for applications where the finished wall has not been decided upon.
Date published: 2013-03-31
Rated 1 out of 5 by from Not suitable for receptacles I installed 25 throughout my workshop. The reason I went with these is because didn't know if I would add wainscoting at a later point. Therefore I didn't know the exact the thickness of my inside wall at the time of the electrical installation. If you plan use a heavy duty receptacle, one that will actually hold your plug DO NOT USE THESE BOXES! It will move back and forth in the wall, and I can only estimate that it will be a matter of time before the flimsy threads on every one of these break and I will have to replace all of them. I would not recommend these to anyone to use for receptacles.
Date published: 2014-02-09
Rated 5 out of 5 by from these things are great for a remodel i got a dozen in the basement esay to use adjustable for drywall cant get much better
Date published: 2016-01-17
Rated 5 out of 5 by from Very Handy Box As others have said this box is particularly handy because of the depth adjustment. I recently ran across this box and will use it on future installs.
Date published: 2013-12-08
Rated 5 out of 5 by from Excelent for new construction easy install and easy adjust after finishes are installed.
Date published: 2014-11-04
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